nikui = hard, difficult
nikui is the base form and its 連用形 is nikuku.
So, nikui + nai would become "nikuku nai".
"ja" is a shorten form of "deha".
You cannot add "deha (ja)" after words ended "i", that is adjectives.
For example, It is not red.
--- "Akaku nai" is OK
--- "Akai deha(ja) nai" is wrong.
Can you say Aka ja nai? And if so, does that mean you can nominalize all -i adjectives and do the same? I'm pretty sure you cannot, but if you could these would be correct, in theory:
Ao ja nai (Is not blue)
Yominiku ja nai (Not hard to read)
Paatii shita ja nai (To not want to party)
Waruku na ja nai (Not not bad)
If this is ignorant, I apologize. Just a quick unresearched question.
"kirei na" is not "kirei + na", it is 連体形 of 形容動詞 "kireida".
The end of 形容詞 is "i", and the end of 形容動詞 is "da".
"kirei" is not 形容詞, but it is the stem of kireida.
base form kireida
the stem kirei
kirei daro
kirei dat[ta]
kirei de[nai] => 'kirei ja nai' is OK
kirei ni[naru]
kirei na[onna]
kirei nara
About the tabenikui dewa nai, etc., it's possible in rhetorical questions. For example, this would mean something like, "hard to eat, isn't it/don't you think?" Also, I hear that a small percentage of people in Japan inflect the copula in polite adjectives, so some people say things like atarashii deshita. As far as I know, though, it hasn't become very popular (which follows the "small percentage" part ).
そういうのだったら何でもpossibleですよ。
"easy to eat"は「食べにくい」ではない。
例えば,"XXXX" is wrong.のXXXの部分にはどのような
間違った文章も入れることができます。
僕の発言は"It's not hard to eat"についてですので,気をつけて下さいね。
さて"It's not hard to eat"から離れると,
Buntaroさんの"tabenikui ja nai"もこれだけじゃ間違いとは言えません。
(ラーメンを食べるのにスプーンを渡されて)「なにこれ,食べにくいじゃない」
というように「食べにくいじゃない」が正しい状況もあります。ただし,この意味は,as you know, "It's not hard to eat" ではありませんね。"It's hard to eat"です。
Glenn said:
Also, I hear that a small percentage of people in Japan inflect the copula in polite adjectives, so some people say things like atarashii deshita. As far as I know, though, it hasn't become very popular (which follows the "small percentage" part ).
Yeah, I'm no fan of it either, and in fact I was on that side of the argument against someone telling a beginning student of Japanese that it is correct, or that they should use it. But I saw a study that showed that something like 5% of the Japanese population says it. On a related note, I'm not really a fan of things like iku desu either.